Chain saw



G. MEYER.

CHAIN SAW.

APPLlcATloN man JULY 21. 1920.

1,387,605. Patented Aug. 16, 1921.

Geazyelqyel UNITED STATES GEORGE MEYER. OF SEATTLE. WASHINGTON, ASSIGNOR TO LENA PATENT OFFICE.

MEYER, `OIE* SEATTLE, XVASHINGTON.

CHAIN SAW.

Application filed July 27, 1920.

` city of Seattle, county of King, State ot' Cil ll'vasliington, have invented certain new and useful Improvements in Chain Saws, ot which the following is a speciiication.

My invention relates to chain saws.

The object of my invention is to produce a chain saw ot an improved type oi" construction, and particularly one which may be made ot stampings, and in a manner of construction which will cheapen the cost thereof, and which will yet be thoroughly efficient, strong and reliable.

My invention consists of the novel parts and combination ol' parts which will lpe hereinafter described and then particularly pointed out in the claims.

In the accompanying drawings I have shown the construction oi my device as I now prefer to make it.

Figure 1 is a side view ci a iew links of the saw, the side plate at one side being removed for certain of the links, to thus better show the interior construction.

Fig. 2 shows the manner in which the saw may be bent to pass the carrying and driving pulley.

Fig. 3 is a transverse section through the pivot of one of the links.

The saw is composed ot two different kinds of links, one type` carrying the teeth and the other serving as connecting links tor the first kind. The teeth carrying links each consist ot' a tooth carrying plate l, two side plates 2, and a filler bar 3. The tooth-carrying plate 1 consists of a straight base section having two thicknesses; the part 10, which is outside of the adjacent edge oi? the side plates 2, is thicker than the web 11, which lies between the edges' of the side plates. The side plates 2 are oi a thickness such that when secured to the tooth carrying plate 1 the outer surfaces will be Hush. These plates are secured together in any suitable manner, as by use of rivets 12.

At the opposite edge of the side plates 2 is a filler bar 3. The inner edge of this lille-r plate 3, or that edge which contacts with the wheels over which the chain runs, and the inner edges of the side plates 2 adjacent thereto, should be convexly curved, as shown at 32, in order that it may tit snugly upon the supporting wheel A, and in order to obviate any tendency for vone edge Specification of Letters Patent.

Patented Aug. 16, 1921. Serial No. 399,373.

of the link to cock up and throw the chain from a true straight line. This plate 3 is also secured by rivets or any other suitable A spacing washer t is also placed the side plates 2, and the side plates are secured thereto by means of a rivet 40.

Each of the teeth carrying plates above described are secured to form adjacent edges of the teeth carrying links abut. his is illustrated in Figs. 1 and 2.

'the teeth carrying plates 1 are offset lengthwise of the chain with relation to the other parts of their link, as is clearly shown in Fig. 1. This causes one end of the tooth carrying plate to project beyond the end edges or' the side plates 2, while the other end of the tooth carrying plate is back from the adjacent end, each of the plates 2 thus forming a recess into which enters the projecting end of the tooth carrying plate of the adjacent link; this further interlocks the links to prevent. twisting thereof.

The outer edges of the connecting links 5, meaning portions 50, or that portion which extends between points opposite the .fhaia pivots. straight and parallel with the line connecting the pivot centers. Immediately outside of these points the outer edge of the link has a short curved sector 51 having its center of curvature at the pivot center of the links. Outside of this curved sector is a tangent 52 which extends to the end of the link. The extent oi the curved sector 51 and the angle which the tangent edge 52 makes with the line connecting the pivot centers, depends upon the bending angle v-:hich is desired in order to pass the same about the guiding and driving pulleys.

The inner edge of the connecting links 5, toward their outer ends, have a bearing upon the liller bar 3. as is shown in Fig. l. This edge of the connecting links is cut away, as shown at 53, so as to permit swinging of the links when the same is bent. VheD, however, the chain has reached the limit of its bend in this direction, I prefer to have it contact with the outer ends of the filler bars 3 so to prevent further bending. As an alternative form of construction the inner edge ot the links 5 may be made straight, as is shown at 54tin Fig. l, andthe inner edges of the iller bar 3 may be beveled, as shown at 30. To permit inward bending it is also necessary to cut the inner corner of the side plates 2, as is shown at 20. The angle of this cut will determine `the maximum end ing oi' the chain in this direction. l prefer to have the cut such that when the maximum bending movement has taken place these edges will come in Contact. To. best secure this result the edges 2O should be connected with the edges 22, whichare in contact when the chain is *straight7 by a short curved sector 2l, to which the two edges 2O and Q2 are tangent. 4

This chain, it will be seen, is composed ot parts ot such character that they may be all cut trom sheet instal without further work, excepting the tooth carrying plate l. lThis plate has an inner web section ll, which is thinner than the body thereof. This may, however, be cheaply formed as a drop forging. rI he parts may, therefore, be cheaply made, and also cheaply assembled, `also Vthe different parts `may be made ot material having difi'erent characteristics and, qualities, it this be desired. "In consequence, of this,the saw may be chea'plyniade and also readily repaired and kept inf good working condition. i 1 V- VVhat l cla-iin asiny invention is:

i l. A chain saw comprising one set ot links each composed ,of a toothed plate, two side plates overlapping the inner edge ot the toothed plate and a iiller plate between the opposite edges otfthe side plates, and another set oit connecting links entering between the side plates, pivots connecting the connecting links `and said side plates, the inner edge ot the toothed plate and the outer edge of. the links being engaged at the adjacent ends of the teeth the ends of said toothed chain sections are in a straight line, the outer edge of the connecting links having a curved sector which maintains substantial engagement with the inner edge of the toothed plate when the chainbends inward and a tangent extending from said curved sector and engaging the inner edge of the toothed plate to limit the inward bending oit the chain.

2. A chain saw comprising one set of links each composed of a toothed plate, two side plates overlapping the inner edge of the toothed plate and a filler bar between the opposite edge ot the side plates, and'a set ot' connectingl links entering between said side plates and pivots passing through said links, carrying links outwardly ot their line of pivot centers Vabutting when the chain is straight, the outer edge of the connecting linkhaving a section which when the chain is straight engages the inner edge of the toothed plate at the ends thereof the inner edge of the connecting links at the same time engaging the edge oit the filler bar toward its center to further prevent bending o'r' the chain in one direction beyond a straight line.

3. A chain sawas in claim 2 in which the outer edges of the connecting links are out away at their endsand the adjacent edges of the connecting links and the ends oit the tiller bars are cut to permit bending in one direction. i

n A chain saw as in claim Q, in which the tooth carrying plates are displaced lengthwise oi the chain with relation to the side plates to form a recess at one end and a projection at the other to enter the recess in the ad'acent link; l

igned at Seattle, Vlashington, this 19th day of July, 1920. y

' GEORGE MEYER.

plates when the 

